Cam-forming machine



June- 16, 15325.

P.A.RMCHE CAM FORMING MACHINE Filed Jan. 1 1924 2 Sheets-Sheet EEQEI after ueq June 16, 1925,

P. A. RAICHE CAM FORMING MACHINE F'iled Jan. 16

1924 2 Sheets-Sheet 2 Z 0M n 7. a, m \m \m f a g ili' Patented June 16, 1925;

PATENT Tana, A. RAIGHEOE aaov-Inmvcii, anon]; lSLA-ND.

i CAM-FORMING MACHINE.

I ,Appl ication filed January 16,1924 seri lrraesaesz.

T 0 all whomyit may concern: I

Be it known that I, gPAUL A -RAICHE, a

citizen of the United st-ates, residing at Providence in the county of: Providence and State of Rhode Island, have invented certain niethod by which itri's :beinglaid out and g ,Machines,: of which the following i bar-adapted torbeladjustedto the desired.

angle to obtain the relative. rise ofthe cam, the same adaptedto be advanced at a predetermined 39M tpiinip art motion due to the vinclinationof this ;bar, .to' a ,pencil which is, arraugedto describe theoutline of the cam on, the *WQIZk-,O1' sheet :of -;paper mounted on a rotatable table, which is ,re volved at -;a constantspeedsrelatively totthe feeding moyement of i the. angle: bar.

invention consists of :certain ,novel features oficonstruct-ion, ,asqvill beinore "fully described, andpartic appendediclaimsiu V p n h company ng mew-w g r i ur 4W pla i w tq mymp 'pv d d a: ari g and aying ant-mac i e: I

flarly pointed out in ;the

gur 2 i s b qn an w 1 gneedbe removed in fin shing the surface n ig i msid el va ie a th i mat n li gu e e-is 'W fileYE 'Q -Nm lin 1 Fi u 1 e ng a he id sit n o the i; ws-and l vm th (d w n i bl w n the iworm andz gear ,in (section: for rotating oam-developing machine is (mounted. The

gmachine has :a guide bar 11 vpreterahly formedwvith a dovetailed ,groove ,and is I t e am al t e seg en by isk th ap nai i a iii a r sitlw zQ Q Ffi Dg sheet. l V 1 Fig. ti a 5Q T-QI 1i .I a F ire 1 ,1 gloolgin-g in -;t1 h e d rect gn [of the-s arrows fl t S W fl h art l g -Slide ba asst-m un in d e a e eid be a d i-t l a e ba a en a n wil a the abe Figure 6 is a section ,online 6+6o1f Figure 1 showingthe bearing on. the slide bar as arranged to receive the main teed screw. 7 o v Figure ,7 lndlcates a cam lobe and the developed mechanically by the operationoi' my machine. i

It isi'ound in the laying out ofcamsfof this character by the ,old method, Wherethecombined" rise and advance is laid out by I "hand that when the radiusis swung between two definite given points, from some ill- ;definite point which maybe decided upon by the draftsman that the ivorking i'acepof "the cam 'lobe is usually vfarpfroin :beil gacvcurate and when transferred :to the metal cam itself, as is the case Wherescrewcutting cam lobes aredeveloped $01 an automatic 1 distance ,of travel .which togethenwvith the speed of rotation of the Work determines the absolute accurate curve or lead of the I I ivorking edge of the cam, thus obviating the With these and other objects in view, the;

quired. v7 I f it is possible w th my machine to make an accurate lay out ofthe cam on paper,

it is therefore possible to. transfer these linesto metal so that an accurate vteinplet may ;be formed, and by the use of such a ternplct only the minimum amount: of-lstock a cam-cutting machine;and theiollowing is a detailed description otone means iby which these" advantageous results may be accomplished zf I -Vith reference to ;the drawings, 10 designates a base or table onuw hichamy improved secured by bolts 12 to the base-ortable In this guidehar,-l havejmounted aslide bar [13 of corresponding dovetail shapeto islide longitudinallytherein;i Boltedto one end ojrl thi-s slide bar jas, at 14 is .the graduopposite end in the bearing 23 and a nut 24 is threaded onto this screw and connected by means of the bracket 25 to the slidebar 13, whereby the rotation of this'screw is caused to move the slide bar together with its inclined bar endwise at a speed which is determined by the speed of the driving motor 26 which is arranged to drive the screw through pulley 27, belt 28 and pulley 29. A handle 30 is also provided on the pulley 29 whereby the machine may be operated by hand independently of the motor, when desired.

In order to lay out'or develop the lead of the cam on the work which includes its rise with relation to its rotation, I have provided a turn table 31 for supporting the work or sheet and which is rotated at a constant speed and in time with the rotation of the drive screw 21 through the bevel gears 32, shaft 33, spur gears 34, jack shaft 35, worm 36 and worm gear 37, which latter is mounted on and fixed to the upright shaft 38 by set screw 39 to which the table 31 is also fixed by set screw 40.

On this table, I preferably mount and fix the work which in this case is a sheet of drafting paper 41 and on which paper the cam is laid out, developed or formed. By the term work I include either the sur face on which the cam is laid out. or the metal in which the cam is cut, and by tool I mean either the point which forms the cam on the paperor the cutter which forms the cam in the metal.

In some instances, this sheet of paper may be plain, or as illustrated. in Figure 1, may he graduated into convenient units as occasion may require so as to visibly indicate in a general way the correctness of the work as it progresses.

In order to describe the lines on the paper in the development of the cam, I have fixed a tool or pencil carrying arm 42on an upright shaft 43 to extend over the table and on the outer end 44 of this arm is mounted a short vertical shaft 45, on the lower end of which is secured a disk 46 with a tool, which in this case may be a pencil 47 or pen, mounted therein and offset from the rotating center of the disk a distance which is equivalent to the radius of the cutter which will be employed in the final finishing of the cam in metal. This pencil point is revolved about the center of this shaft by means of an electric motor 48 through a belt 49, pulley 50, belt 51 and pulley 52, to describe a multiplicity of closely formed circles as it is being moved over the surface of the paper due to the combined rotation of the table and the radial rise of the pencil whercliiy the common tangential line of these circles indicates the working face of the cam.

In order to obtain the desired rise of the cam as indicated in Figure 7, by the line 63, developed by the tangent of the intersecting circles 64 described by the revolving pencil with relation to the rotation of the cam, I have provided a motion-transmitting rack-bar 53 to slide endways in bearings 57, and which bar is provided with teeth 54 to engage those of segment which is mounted on'and fixed to shaft 43, and also on this rack-bar near the opposite end, I have mounted a roll 56 which engages the adjacent edge of the incline bar 17 whereby the endways movement of the slide-bar 13 with its incline bar 17 under action of the screw 21 causes the pencil 47 to be swung by the arm 42 outwardly towards the pcriphery of the cam, and this screw at the same time, is caused to transmit a rotating motion to the turn table 31 and its sheet 41. to simultaneously develop the advance of the cam line. Therefore, it will be seen by my improved construction of machine for mechanically laying out cams that the rise of the cam may be determined by the extent of inclination of the inclined bar 17 in which case the pencil or tool is'moved outwardly which movement cooperating with the rotation of the table serves to determine the accurate peripheral curve of the cam.

In forming the drop of the cam as indicated by the dotted line 62 in Figure 7, it is only necessary to remove the roll 56 from engagement with the upper edge of the incline bar and insert it in the dotted position to engage the lower edge of the ba' and then by reversing the direction of rotation of the main driving motor 26 and screw 21. this slide-bar 13 with its incline bar 17 is caused to move back towards the left. order 'that'the turntable '31 shall continue to move in its original direction while the pencil driving parts are caused to move in the opposite direction, I withdraw the clutch 58 from the table driving gear train and connect the clutches 59 to drive through the reverse gears 60 and the speeding-up gears 61 the ratios of which are now' arranged to increase the relative rotating speed of the table 31.

I have shown and described my improved cam developing or forming machine as adapted to develop, form or lay out a cam by moving a tool such as a pencil or pen over the face of a sheet of paper, the ma- Inv chine being formed ofa comparatively light construction to be used in a drafting room, but by making this machine heavier and positioning a cutter of thediameter of the circle described by the pencil in the pencilhead, instead of the pencil, and mounting a metal cam blank on the shaft 38, instead of the turn table 31, the cutter may take the place of the pencil and operate upon the edge of the cam to form or finish the working edge of the same, and any machine of my general construction which is adapted to operate a tool to form the working face of a cam either on paper or on the metal itself, will fall within the spirit and scope of this invention.

The foregoing description is directed solely towards the construction illustrated, but I desire it to be understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptible, the invention being defined and limited only by theter rns of the appended claims.

I claim.

1. In an automatic cam-forming machine,

pivoted tool-carrying arm mounted to swing over said table, an endways movable slidebar, a movable rod connected to rotate said tool arm on its pivot, an inclmed bar mounted on said slide bar to move said rod, and

means for moving said slide bar and its inclined bar and simultaneously rotate said table to cause the tool to develop a cam on the work.

4 3, In'an automatic cam-forming machine, a rotatable work-carrying table, a tool, a

pivoted tool-carrying arm mounted to swing over said table, a Slide bar, an inclined bar mounted on said slide bar to be moved longitudinally by Said slide bar, means including a rack bar and segment through which motion may be transmitted from said inclined bar to said tool arm, and means for rotating said work table at a predetermined speed relatively to the swinging movement of said arm to cause the tool to describe a cam curve on the work.

4;. In an automatic cam-forming machine, a guide frame, a slide bar in said frame, a rotatable work holder, an inclinable bar carried by said slide bar to be set at a predetermined angle to the path of travel of said slide bar, a tool arranged to operate upon the work, means for advancing the inclined bar to move said tool over the work, and means for simultaneously rotating the work at a speed relative to the advance of the inclined bar to cause the tool 'to describe a cam of the desired shape on the work.

5.. An automatic cam-forming machine, comprising a. slide bar having a graduated arcuate segment at one end, an inclined bar pivoted at one end to said slide bar, its free end being adapted to work over said are, a screw for feeding said slide bar and inclined bar, a turn table for supporting the work, a tool, a tool-arm adapted to swing over said table and move the tool to operate upon the work, a segment, a rack i bar operated by said inclined bar to move said segment to swing and move its tool over the work at a speed relatively to the ture. I

' PAULA. muons. 

